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“Lime”in this context refers to the white powder from limestone. People used to make lime in kilns for all sorts of uses but principally to make mortar for house construction. The kiln's interior is bright white; Brand's heart rests inside his skeleton in the form of pure lime. This may indicate that a possible purging of sin occurred. In the end, he cries out, “O mankind, whose brotherhood I have cast off, and trampled they great heart behemoth my feet!”